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A U.S. Air Force KC-135 Stratotanker aerial refueling aircraft from the 909th Air Refueling Squadron refuels a 44th Fighter Squadron F-15 Eagle while two other F-15s fly in formation during a training mission over Okinawa, Japan, April 5, 2013. The KC-135 and F-15 are two of five aircraft regularly operated from Kadena Air Base. (U.S. Air Force photo by Senior Airman Maeson L. Elleman/Released)